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Related Concept Videos

Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
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Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
The Doluisio method involves perfusing a prepared segment of a rat's small intestine with a solution of radiolabeled drug and a non-absorbable marker. This helps to differentiate between absorbed and non-absorbed drug concentrations. The intestinal segment is connected at both ends using tubing and syringes,...
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Factors Influencing Drug Absorption: Anatomical Parameters01:23

Factors Influencing Drug Absorption: Anatomical Parameters

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Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
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Synthesis and Regulation of Thyroid Hormones01:20

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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
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Drug Absorption: Factors Affecting GI Absorption01:19

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The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
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Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

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Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
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Levothyroxine Absorption Test to Differentiate Pseudomalabsorption from True Malabsorption.

Sujoy Ghosh1, Subhodip Pramanik1, Kaushik Biswas1

  • 1Department of Endocrinology and Metabolism, I.P.G.M.E&R, Kolkata, India.

European Thyroid Journal
|February 20, 2020
PubMed
Summary

The levothyroxine absorption test can diagnose non-adherence in hypothyroid patients. A free T4 increase above 0.40 ng/dL at 3 hours helps rule out malabsorption, guiding further investigation.

Keywords:
ComplianceLevothyroxine absorption testPrimary hypothyroidismPseudomalabsorption

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Area of Science:

  • Endocrinology
  • Thyroid Disorders
  • Gastroenterology

Background:

  • The levothyroxine absorption test for pseudomalabsorption in hypothyroid patients lacks standardization.
  • Identifying patients needing malabsorption workup is currently undefined.

Purpose of the Study:

  • To standardize the levothyroxine absorption test for hypothyroid patients.
  • To define criteria for malabsorption workup in hypothyroid patients.

Main Methods:

  • Administered levothyroxine (10 μg/kg) to euthyroid, hypothyroid (newly diagnosed, treated with normalized TSH, treated with elevated TSH), and malabsorption groups.
  • Measured free T4 levels hourly for 5 hours to assess absorption profiles.
  • Determined the diagnostic accuracy of free T4 increment at 3 hours for true malabsorption.

Main Results:

  • Free T4 peaked at 3 hours across all groups.
  • The increment in free T4 from baseline to 3 hours was not significantly different between non-malabsorption groups.
  • A free T4 increment cutoff of 0.40 ng/dL at 3 hours demonstrated 97% sensitivity and 80% specificity for excluding true malabsorption.

Conclusions:

  • The levothyroxine absorption test reliably identifies non-adherence in hypothyroid patients with elevated TSH despite adequate levothyroxine dosage.
  • An incremental free T4 value above 0.40 ng/dL at 3 hours aids in determining when malabsorption workup is unnecessary.